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Simulation of Modes in Terahertz Quantum-Cascade Microring and Microdisk Lasers

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Tamošiūnas V., Kancleris Z., Tamošiūnienė M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
917-920
EN
In our contribution, we report on finite-difference time-domain simulations of modes in microring and microdisk terahertz quantum-cascade lasers with external radii of 100 μm and less. Our simulations have revealed a possibility of low radiative loss for lowest and second order whispering gallery modes in such devices, even when the effective mode volume is reduced below the cubic wavelength.
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Yearly, Seasonal and Daily Variations of Radio Refractivity

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Žilinskas M., Tamošiūnas S., Tamošiūnaitė M., Tamošiūnienė M.
Acta Physica Polonica A
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2011
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vol. 119
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issue 4
533-536
EN
Yearly, seasonal and daily variations of radio refractivity have been analyzed. The method proposed in the recommendation of International Telecommunication Union ITU has been used. The local meteorological data have been used in calculation of radio refractivity. The highest values of the radio refractivity have been observed in Klaipėda (in Seacoast) in the year 2009. In July, the values of the radio refractivity were highest in all localities investigated here and over all the time of the day in the year 2009. In the continental part of Lithuania (in Vilnius and Kaunas), analysis of radio refractivity has been made by using the meteorological data of longer period (starting from April 2005 up to July 2010). Five-year meteorological data collected in February, April, July and October have been used. It was obtained that the values of refractivity in the year 2010 are much higher than ones obtained in all the years of the period investigated here.
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